<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 300px;
            height: 300px;
            /*background-color: rgba(14, 14, 228, 0.6);*/
            background-color: hsl(351, 80%, 51%);
            border-width:10px;
            padding-top: 200px;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <div>
        这是内容
    </div>
    
</body>
</html>